Mitsubishi Q Series Programming Guide

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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
: First five digits of serial No. are 04122 or later.
High Performance
Basic
QCPU
PLC CPU
Process
CPU
Applicable
CPU
Redundant
CPU
Universal
4.4.3 Block operation status check instruction (a, b, &a, &b, la, lb)
Usable Devices Programs Using Instructions Execution Site
Internal Device
(System, User)
Link Direct
J
\
SFC Program
Bit Word
File
Register
R
Bit Word
Intelligent
Function
Module
U
\G
Index
Z
Constant
K, H
Expansion
SFC
Other
BLm
Data
Type
Sequence
Program
Step
Transition
Condition
Block Step
Transition
Condition
S
Device
name
| aBLm
| bBLm
| aBLm
| bBLm
BLm
BLm
aBLm
bBLm
& aBLm
& bBLm
aBLm
b
BLm
& a
BLm
& b
BLm
BLm
BLm
BLm
BLm
When expressed in a circuit When expressed in a circuit
m is a block No., and is a contact.
[Function]
(1) Checks whether the specified block is active or inactive.
(2) The contact status changes as described below depending on whether the specified block is
active or inactive.
Block Status
Contact of N/O Contact
Instruction
Contact of N/C Contact
Instruction
Active ON OFF
Inactive OFF ON
(3) The contact is always OFF if the block that does not exist in the SFC program is specified.
REMARKS
As the “BLm” device is treated as a virtual device, the contact on the monitor of a peripheral
device does not turn ON/OFF. If the internal device is ON, the coil instruction is switched ON
for operations.

Mitsubishi Q Series Specifications

General

Brand	Mitsubishi
Model	Q Series
Category	Control Unit
Language	English